Beach sand weight vs. volume units

Beach sand has quite high density, it's heavy and it easily leaks into even tiny gaps or other opened spaces. No wonder it absorbs and conducts heat energy from the sun so well. However, this sand does not have the heat conductivity as high as glass does, or fireclay and firebricks, or dense concrete. A fine beach sand in dry form was used for taking these measurements.

In principle with any measuring task, switched on professional people always ensure, and their success depends on, they get the most precise conversion results everywhere and every-time. Not only whenever possible, it's always so. Often having only a good idea ( or more ideas ) might not be perfect nor good enough solution. If there is an exact known measure in cu ft - ft3 - cubic feet for beach sand amount, the rule is that the cubic foot number gets converted into 合 - Chinese gě or any other beach sand unit absolutely exactly.